When you watch the replay, notice that when the ref signals that the Seahawks recovered the fumble by Cooks, there was absolutely zero cheering from the hometown fans.
And why not? Because the Seahawk fans saw the flag and KNEW IMMEDIATELY that it was an illegal hit and that the fumble wouldn't stand. Of course, the flag turned out to be a holding call, but everybody assumed it was for the hit, because it was so blatantly illegal -- whether helmet-to-helmet, defenseless receiverm whatever -- all knew the recovery wouldn't stand. Well, almost all -- the only ones who DIDN'T realize it were the blind zebras standing right next to it.